Fixes #7230, #12021 - Upgrade to Rails 4.1.5

This commits upgrades Rails to Rails 4.1.5. See a description of the
changes included here, and go to the pull request in GitHub to see more
detailed explanations:

• Update gems to a Rails 4 compatible version, including dependencies...

Fixes #11307 - Add host count to hostgroups

Fixes #11444 - Correctly count hosts in domain

Only hosts that have a primary nic assigned to a domain should be
counted in the domain host count. Previous implementation was flawed in
that it only updated the counter in certain occasions and not all,
leading sometimes to incorrect host counts....

fixes #12404 - rake console now works

not sure whether ruby 2.1 is at blame, but IRB's initializer tries to
use the command line arguments to decide how to run the console.
problem? running rake console (--trace) will lead to ARGV to contain
["console"] (and maybe --trace), which, in turn, will run the...

fixes #4151 - enable reports STI

Permits subclassing of ReportImporter and Report to import and store
new types of reports associated to hosts.

Refs #12147 - Remove trends output from tests

Removes the rest of trends output from tests, since ad4db10 only removes
the first part.

refs #12147 - removing informational print from rake task in tests

Fixes #7567 - Substitute find_or_create_by by first_or_create

Rails 3 and 4 both support the syntax 'where(args).first_or_create'.
find_or_create_by is no longer valid on Rails 4 so we should remove it
here already

Refs #3809 - Enable Rails delegate cop

fixes #11170 - pass quoted args through foreman-rake

Use the special "$@" to correctly pass quoted arguments through
foreman-rake, through su and to the underlying rake command. Ensures
the JSON in this command is unharmed:

foreman-rake config -- -k trusted_puppetmaster_hosts -v '["foo.bar.com"]'...